Automatic dental plugger



UNITED ,STATES PATENT OFFICE.

HUGH MCLAREN, OF TORONTO, CANADA, ASSIGNOR TO JAMES W. IVORY, OFPHILADELPHIA, PENNSYLVANIA.

AUTOMATIC DENTAL PLUGGER.

SPECIFICATION forming part of Letters Patent No. 619,832, dated February21, 1899.

Application led October 19, 1897. Serial No. 655,654. (No model.)

To all whom, it Wha/ z/ concern:

Beit known that I, HUGH MCLAREN, dental manufacturer, of the city ofToronto, in the county of York, in the Province of Ontario, Canada, haveinvented certain new and useful Improvements in Automatic Pluggers forFilling Teeth, of which the followingis a speciiication.

My invention relates to an improvement in the class of dental pluggerswherein the hammer is thrown into action by direct-thrust pressure uponthe plugger-point or by a pull upon a back-acting point; and it consistsof the novel construction of parts, as hereinafter described, and.pointed out in the claims that follow the specification.

Figure l represents a view in elevation, partly in section, of a dentalplugger embodying my invention, a portion of the hammersleeve beingbroken away. Fig. 2 represents a longitudinal section thereof. Fig. 3represents a detail of the upper end of the inner casting.

Similar letters of reference indicate corresponding parts in thefigures.

Referring to the drawings, A designates an inner cylindrical casingmade, preferably, of metal and provided at the upper end with slits ct,diametrically opposite to each other, and an annular groove a', wherebya flange a2 is formed at the upper end of the casing and a shoulder a3at the lower end of said groove.

B designates a casing made, preferably, of hard rubber, which iits overthe casing A.

C is the hammer-sleeve, which fits within the casing A and is providedwith a radial slot c at the lower end thereof.

D designates a collar provided with a knurled periphery and an internalgroove CZ and flange d, which fit, respectively, over the flange etz andinto the groove a.

E designates a plungerwhich is hollow at both ends, so as to permitofthe holding of the instrument.

F designates a flat spring which is secured to the plunger bya screwf,extending through the plunger and the thick lower portion of the spring.The upper portion of the spring has attached to or forming part of it apin f', which extends through a hole e in the plunger into a notch ginthe upper end of the sleeve G. The spring F is situated within a slit g'in the sleeve G, and the sleeve is provided with a threaded annularenlargement g2 at the upper end, upon which and the lower threaded endof the cylindrical casing A fits a collar H, having a knurled peripherydesigned to form a means for turning the collar.

. formed in the plunger E directly opposite the spring F and withinwhich such spring is held.

J designatesahook havingabeveled hooked end j and pivoted on Va pin j',extending through the sleeve and slit g.

E2 designates a projecting fiat pin secured in the plunger E andextending into the slot c, as shown.

K designates asleeve provided with an annular enlargement lo, threadedas shown, and a reduced end k', also threaded as shown and havinglocated therein the circular internallythreaded nut L. This nut isprovided with projecting pins'V Z, which extend into the slits a in theside of the cylindrical casing A. The collar D, hereinbefore mentioned,is internally threaded for a portion of its length and screwed upon theannular enlargement lo of the sleeve K, to which it is held securely bythe pin k2, so that the collar and sleeve K will turn together.

M designates a supplemental sleeve which is internally threaded at itsinner end and screwed into the collar D as indicated.

N designates a spiral spring extending between the nut L and the top ofthe hammersleeve C.

O designates a spiral spring located within the spiral spring N andextending between the inner threaded end of the sleeve K and the collaro, secured in position on the plunger E by the pin o', extending throughthe said plunger. (See Figs. 1 and 2.)

The operation is as follows: Upon pressing upon the plugger the plungerE will ascend, carrying with it the spring F and hammersleeve O,againstwhich the pin f of the spring F abuts. The upper beveled end of thespring F in its ascent will necessarily come in contact with the hook J,thereby throwing the pin f' out ot the notch g, whereupon thespring-pressed hammer-sleeve C will be immediately released and saidsleeve will be thrown instantly downwardly by the force of the spring N,so that the hammer-sleeve at the top of the slot c comes in contact withthe pin E2 on the plunger E, thus giving the desired blow.

The spring O, hereinbefore described, serves to keep the plunger in itsnormal position.

The spring N gives the desired force of blow,and said force may beregulated by turning the collar D and sleeve K, to which it is secured,thus impartinga longitudinal movement in either direction to the nut Lalong the threaded inner end of the sleeve, such nut being preventedfrom tu rnin g,as hereinbefore described, by the pins l, extending intothe slits a.

What I claim as new isl. The combination with a plunger,a slittedcasing, a 11am mer-sleeve surrounding the plunger, a short sleeve at theend of the hammer-sleeve, a pivoted hook and means carried by theplunger movable through the same for engaging the short sleeve and theend of the hammer-sleeve and causing the plunger and hammer-sleeve tomove together for a portion ot the travel of the lat-ter and then tocontact with said hook to disengage the plunger and hammer-sleeve, of aspiral spring acting on the hammer-sleeve, and a spring within saidspring for keeping the plunger in its normal position.

2. The combination of a plunger having a transverse perforation,aspring-pressed hammer-sleeve surrounding said plunger, the inner casing,surrounding the hammer-sleeve, a short sleeve at the end of thehammersleeve, a spring carried by the plunger and having a lateral pinextending through the perforation therein to engage the hammersleeve andthereby cause the plunger and sleeve to move together, means foractuating said spring to withdraw its pin to disengage the sleeve, aspring for forcing the hammer-sleeve endwise when thus released, aprojecting pin on the plunger to be engaged by the sleeve, and an outercasing.

3. In combination the plunger provided with a Hat-sided recess near theouter end, the spring-pressed hammer-sleeve through which such plungerextends, the short sleeve suitably held in position and provided with aslit, the spring fitting within the slit in the short sleeve and securedon the flattened side of the plunger, and having a beveled upper end,the pin secured in the upper end and extending through a hole in theplunger into a recess in the shortsleeve so as to abut the end of thehammer-sleeve, the hook pivoted in the slit in the short sleeve andprovided with a beveled hooked end, the slot in the hammer-sleevethrough which such hook extends, and a projection on the plunger, and anouter casino'.

4. The combination of an inner and outer casing, a hammer-sleeve, aplunger having a transverse opening, the short sleeve, a spring securedat one end to said plunger and carrying near its free end a lateralportion normally located in said opening and engaging a shoulder on saidshort sleeve and normally in engagement with the end of thehammersleeve, a spring mounted to force said hammer-sleeve endwise,means for disengaging the lateral portion of the spring from the notchof the short sleeve, and an operative connection between saidhammer-sleeve and plunger, whereby when the former is released it movesa distance by itself and then actuates the latter.

5. The combination of a casing, a hammersleeve, a plunger having atransverse opening, a spring secured at one end to the plunger and itsfree end carrying a lateral portion passed through said opening andnormally engaging the forward end of the hammersleeve, a pivoted memberfor engaging the free end of the spring, a spring for giving thehammer-sleeve endwise movement when disengaged from the lateral portionot the firstmentioned spring, and a projection on the plunger inposition to be engaged by the sleeve in its movement.

6. The combination of a casing, a hammersleeve, a short sleeve having ashoulder, a plunger with transverse opening, a spring secured at one endto the plunger, a lateral projection near the other end of said springpassed through said opening normally resting on said shoulder andengaging the forward end of the hammer-sleeve, a pivoted member forengaging the free end of said spring, a spring for forcing thehammer-sleeve endwise, a projection on the plunger in position to beengaged by the sleeve endwise, a projection on the plunger in positionto be engaged by the sleeve, an outer casing with tubular extensions, acollar secured to one of said extensions, and a sleeve with annularenlargement having threaded engagement with said collar.

7. The combination ot' a casing, a hammersleeve, a short sleeve having ashoulder, a plunger with transverse opening, a spring secured at one endto the plunger, a lateral projection at the other end ot the spring toengage said shoulder, a pivoted member' for disen gagin g the projectionfrom the shoulder, a spring for forcing the hammer-sleeve endwise, meansfor causing the hammer-sleeve and plunger to move together, an outercasing, a sleeve with threaded enlargement and threaded inner reducedend, a collar having engagement with the enlargement, a nut engaging thethreads of the reduced end and having lateral projections engaging slitsin the inner casing.

IIUGH MCLAREN.

Vitnesses: B. BOYD,

H. T. S. YOUNG.

IOO

IIO

